Negative register means for photocomposing machines



Oct. 26, 1937. E. E. COOPER ET AL NEGATIVE REGISTER MEANS FORPHOTOCOMPOSING MACHINES Filed Aug. 15, 1955 Patented Oct. 26, 1937PATENT OFFICE NEGATIVE REGISTER MEANS FOR PHOTO- COMPOSING MACHINESEdward Eugene Cooper and Albert Theodore Troedel, Port Melbourne,Victoria, Australia Application August 13, 1935, Serial No. 36,022

2 Claims.

This invention relates to the setting of a negative in its holder deadcentre in photo-composing machines of the step-by-step type whereinphotographic prints are made upon sensitized plates which are thendeveloped and used in a printing press.

An objective of the invention is to provide a support for the negativeholder wherein is locking means for the holder that is flexible and isopened while the setting or adjustment process is being effected andwhich locking means can then be closed. It is illustrated in theaccompanying drawing, in which Fig. 1 is a sectional elevation of aregister table on which is a negative holder for setting, same being online a-b, Fig. 2.

Fig. 2 is a plan view of the holder and the looking means, while Fig. 3shows the holder in section with negative and air seal in place over atable bearing a plate for printing, and

Fig. 4 is an enlarged detail in section of the locking means.

Fig. 5 is a sectional view showing the form of the screw l4.

' The holder 5 containing the negative 6 is supported in its chase I ina register table 8 in which is the glass bearing the cross lines or thegraticules with which the negative must register. The parts constructedarranged and combined with which our invention is concerned, are the lugplates 9 one being on each side of the negative holder 5 each of whichis provided with an ample bore l0. A hollow and flanged boss H is withineach said bore or opening ID with its flange below the lug and a nut I2is on each boss over said lug. A dowel 13 passes downwards through thehollow boss into the chase I.

The negative holder 5 is oscillated in its mounting to adjust thenegative to dead centre by placing the holder and its chase in theregister table or frame 8. A convenient mode of operation is throughadjustable screws I4 on the upper and left hand sides of the frame 8that are adapted to bear on the edges of the negative holder supportwhile on the lower side is an ad- 'ustable screw I4 and on the righthand side (Fig. 2) are two adjustable screws l4. These and the screw onthe lower side also hear on the edges of the said support and areprovided each with a buffer spring while the first mentioned screws arenot so provided with springs. This mode has been described in a priorpatent granted to the present applicants, No. 1,999,831.

In machines of the kind indicated, it is of great importance to set andmount the negative correctly in its support, that is to say, at deadcentre with the keys or dowels. To this end, the negative before beingplaced in the negative carrier 5 is put in the register frame 8 whichcontains the chase member 1 to which the negative in its mount can besecured, when set to register, by the hasps I5 in the usual manner. Butin order to set the negative quickly and accurately to the artistsmarks, the usual screws M are upon the register frame 8 together withthe screws l4. All are provided with rollers of metal or other suitablematerial on the tips in contact with the negative frame 5 and the screwsIii are provided with spring buffers as shown in Fig. 5, against whichwill be borne the pressure of the screws M by which the negative holdercan be moved in a gyratory way to bring the negative to register deadcentre, the negative holder and frame or mounting 5 meanwhile movingeasily on the rollers I6 of the screws M.

Fig. 5 shows in detail a rod l9 passing through the bearing 20 on thetable 8 and carrying the roller 16 on its inner end bearing against thenegative frame 5. The rod I9 has two stops 2| and 22 and the bufferspring 23 is coiled around the rod in a bore in the bearing and bearsagainst the inner stop 2| and against the inner surface of a screwthreaded cap adjustable on the bearlongitudinal movement and the rod I9is threaded through a part of its length. Hence, rotation of the screwhead moves the rod l9 longitudinally.

With the nuts l2 loosened and the dowels 13 inserted through the hollowbosses II and into the chase I, the lower and right hand screws l4 maybe manipulated to oscillate the negative holder with its support inbearing contact with the first mentioned and rigid but adjustable screwson the top and left hand sides to set the negative dead centre.

When the setting of the negative has been completed the nuts aretightened and the holder and the chase are transferred to a step-bystepphoto composing machine in which the negative will be over a sensitizedplate for the transfer thereto of the photographic image on thenegative. Hasps l5 on said chase engage each corner of the negativeholder after the setting has been completed.

Thus, by means of the hollow bosses and the ample clearance allowed inthe bored lugs, the negative holder is free, with the nuts loosened, tobe manipulated and properly set. This being effected, the nuts aretightened up to secure the holder on its chase.

Having now described our invention, what we claim as new and desire tosecure by Letters Patent is:

1. In setting means of the kind indicated, a negative holder supportinga photographic negative and a chase supporting the holder, a bored lugpermanently fixed on each side the holder and extending over the chase,a hollow flanged boss passing through the bore of the lug with ampleclearance, a nut to each boss, a dowel that passes through each bossinto the chase adjust ing rollers bearing against opposite sides of saidnegative frame and means for adjusting said rollers inwardly andoutwardly, the rollers on two adjacent sides being yieldingly supportedwhereby said frame may be moved in a gyratory manner.

2. In setting means of the kind indicated, a register frame, a negativeholder and a chase supportingsaid holder in the frame, a bored lugpermanently fixed on'each side of the holder and extending over thechase, a hollow flanged boss passing through the bore of the lug withample clearance, a nut to each boss, a dowel that passes through eachboss into the chase and means on said frame for imparting to said holderoscillatory movements when the nuts are loosened.

EDWARD EUGENE COOPER. ALBERT THEODORE TROEDEL.

